bug#69097: [PATCH] Add 'kill-region-or-word' command

[Juri Linkov]

>>>> > +(defcustom kill-word-if-no-region nil
>>>> > +  "Non-nil means that `kill-region' without a region will kill the last 
>>>> > word."
>>>> > +  :type 'boolean
>>>> > +  :group 'killing)
>>>>
>>>> What a strange thing.  `kill-region' is not related to word commands
>>>> in no way.  Why not kill a sentence?  Why not kill a line?  Why just word?
>>>> All existing commands handle an active region.  But there is no commands
>>>> that do in the opposite direction where a general command handles
>>>> one random specific case.  This is because the region is a more
>>>> general concept.
>>>
>>> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=69097#14 is supposed to
>>> provide the rationale (consistency with what C-w does in a terminal,
>>> which I presume means in Bash or similar programs which use
>>> Readline?).
>>
>> So this is for Readline compatibility:
>>
>>   unix-word-rubout (C-w)
>>     Kill the word behind point, using white space as a word boundary.
>>     The killed text is saved on the kill-ring.
>>
>> Then I have no opinion, since 'backward-kill-word' (C-<backspace>, M-DEL).
>> already does this just fine.
>
> Right, the initial command just merges `backward-kill-word' and
> `kill-region' into one.

There are two ways to merge:
1. `backward-kill-word' into `kill-region'
2. `kill-region' into `backward-kill-word'

I don't know why prefer one over another.